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Communication: Molecular gears
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A. C. J. Weber, E. E. Burnell, W. L. Meerts, C. A. de Lange, R. Y. Dong, L. Muccioli, A. Pizzirusso, and C. Zannoni, J. Chem. Phys. 143, 011103 (2015).
P. Diehl, H. Kellerhals, and E. Lustig, NMR Basic Principles and Progress (Springer-Verlag, Berlin, 1972), Vol. 6, p. 1.
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The 1H nuclear magnetic resonance spectrum of hexamethylbenzene orientationally ordered in the nematic liquid crystal ZLI-1132 is analysed using covariance matrix adaptation evolution strategy. The spectrum contains over 350 000 lines with many overlapping transitions, from which four independent direct dipolar couplings are obtained. The rotations of the six methyl groups appear to be correlated due to mutual steric hindrance. Adjacent methyl groups show counter-rotating or geared motion. Hexamethylbenzene thus behaves as a molecular hexagonal gear.
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